COST 507 - Repositório Aberto da Universidade do Porto

system. Alloys at compositions of 1, 2 and 3 - prepared in Vienna - and at 6 wt% Mn -
prepared by Alean - have been studied to determine liquidus, phase boundary and
invariant reaction temperatures,. The thermal arrests found so far are summarised in
the Table 1 below and shown in Figure 2.
Table 1 - Al-Mn-Si results
Alloy
Comp
wt%Mn
1
2
3
6
Eutectic Reaction
Temperature (°C)
Heating
576.9
577.0
576.1
578.0
Cooling
575.8
576.7
576.4
576.0
Heating
635.6
636.7
639.1
614.8
Other Thermal Arrests (°C)
Cooling
633.0
634.1
637.0
640.5
Heating
-
-
-
715.6
Cooling
-
-
-
694.3
Liquidus
Temp
(°C)
667.9
-
702.9
759.3
4. Al-Fe-Mn measurements(Anja Semeeis)
Smith thermal analysis studies were carried out by Serneels and Hayes on four Al-Fe-
Mn alloys with 2wt% Mn, with 0.5, 1, 2 and 3wt% Fe respectively. Sample were
prepared in Leuven by melting and casting master alloys with Al under an Ar
atmosphere. Experiments were carried out determine liquidus, secondary separation
and invariant reaction temperatures. Following Smith thermal analysis, the phases
present in the samples were identified using optical metallography, XRD and
SEM/EDX. DSC measurements were also carried out on the same samples. The
thermal arrests found so far are given in the Table 2 below and are shown in the Figure
3. It is seen that the Smith results for the Al 6 Mn liquidus temperatures are consistently
higher than those given by [43Phi]; other temperatures agree well.
5. Al-Mn and Al-Fe-Mn measurements (Franz Weitzer)
Seven selected Al-Mn alloys were studied by the Smith method. In addition to
equilibrium phase boundary and reaction temperatures, metastable reactions were also
studied on cooling. The results are summarised in Figure 4 superimposed on the phase
diagram published in [90Mas] after [87McA]. The present results agree well with the
data presented by [87McA]. Eight further alloys, Al^Mn, Algi.3Fe2.2Mni6.5,
Al8i.3Fe 5 .7Mni3, A^FeeMn^, A^FeicsMn^.g, Al 76 Fe 8 Mni 5 , A^Fe^Mn^·
Al72.5Fei8.5Mn9 5 and AlrøFeiisMnics were also studied. Samples were prepared in
Vienna. Results have already been presented [96Wei].
6 References
40Smi
43 Phi
87McA
90Mas
92Hor
C S Smith, Trans. American Inst. Met. Eng., 1940, 137, 236-245.
H W L Phillips, J.Institute of Metals, 1943, 69, 275-316.
A J McAllister, J M Murray, Bull.AUoy Phase Diag, 1987, 8, 438-447.
Τ B Massalski et al, Binary Alloy Phase Diagrams, 2 nd edition, 1990.
Ρ J Horrocks, F H Hayes and N D Moulson, Thermochimica Acta,
1992, 204, 25-33.
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